Robust improper signaling for two-user SISO interference channels

Abstract: It has been shown that improper Gaussian signaling (IGS) can improve the performance of wireless interference-limited systems when perfect channel-state information (CSI) is available. In this paper, we investigate the robustness of IGS against imperfect CSI on the transmitter side in a two-user single-input single-output (SISO) interference channel (IC) as well as in a SISO Z-IC, when interference is treated as noise. We assume that the true channel coefficients belong to a known region around the channel estimates, which we call the uncertainty region. Following a worst-case robustness approach, we study the rate-region boundary of the IC for the worst channel in the uncertainty region. For the two-user IC, we derive a robust design in closed form, which is independent of the phase of the channels by allowing only one of the users to transmit IGS. For the Z-IC, we provide a closed-form design for the transmission parameters by considering an enlarged uncertainty region and allowing both users to employ IGS. In both cases, the IGS-based designs are ensured to perform no worse than proper Gaussian signaling. Furthermore, we show, through numerical examples, that the proposed robust designs significantly outperform non-robust solutions.

 Autoría: Soleymani M., Lameiro C., Santamaria I., Schreier P.,

 Fuente: IEEE Transactions on Communications, 2019, 67(7), 4709-4723

Editorial: Institute of Electrical and Electronics Engineers, Inc.

 Fecha de publicación: 01/07/2019

Nº de páginas: 14

Tipo de publicación: Artículo de Revista

DOI: 10.1109/TCOMM.2019.2910549

ISSN: 0090-6778,1558-0857

Proyecto español: TEC2016-75067-C4-4-R

Url de la publicación: https://doi.org/10.1109/TCOMM.2019.2910549